qml: silence DevConsole qmllint warnings (pragma + required property)

Qt 6.5.3's qmllint exits 255 on these two warnings even though older
qmllints only warn:

  - Outer-id access from a delegate (`width: view.width`) requires
    `pragma ComponentBehavior: Bound` to make the binding explicit.
  - Implicit role injection (`text: model.text`) should be a
    `required property`. Renamed the model role from "text" to "line"
    so the required property doesn't shadow Label's own `text`.

Behaviour unchanged. Verified `make quality` from framework/skeleton
green; the framework's `php_qml_bridge_qmllint` target now lints
clean (no more warnings on DevConsole.qml).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

framework/qml/qml/DevConsole.qml

@@ -1,3 +1,5 @@
+pragma ComponentBehavior: Bound
+
 import QtQuick
 import QtQuick.Controls
 import QtQuick.Layouts
@@ -27,7 +29,7 @@ Rectangle {
     ListModel { id: lineModel }
 
     function append(line) {
-        lineModel.append({ "text": line });
+        lineModel.append({ "line":line });
         while (lineModel.count > maxLines) {
             lineModel.remove(0);
         }
@@ -40,7 +42,7 @@ Rectangle {
         lineModel.clear();
         const tail = BackendConnection.childLogTail();
         for (let i = 0; i < tail.length; ++i) {
-            lineModel.append({ "text": tail[i] });
+            lineModel.append({ "line":tail[i] });
         }
         if (autoScroll.checked) {
             view.positionViewAtEnd();
@@ -114,8 +116,10 @@ Rectangle {
                 ScrollBar.vertical: ScrollBar { policy: ScrollBar.AsNeeded }
 
                 delegate: Label {
+                    required property string line
+
                     width: view.width
-                    text: model.text
+                    text: line
                     color: "#d6dee7"
                     font.family: "monospace"
                     font.pixelSize: 11